Reinforced concrete construction.



J. W. BRAGSTD.

BEINFORCBD CONCRETE CONSTRUCTION.

APPLICATION FILED OCT. 21, 1913. i

Patented Aug. 18, 1914.

2 SHEETS-SHEET l.

w/rA/Essfs.'

J. W. BRAGSTAD.

BEINFORGED CONCRETE CONSTRUCTION.

APPLIoATIoN FILED 0012.21, 1913.

1,107,486.D Patented Aug. 18, m4..

2 SHEBTS-BHEET 2.

JQSEJPH W.

lf GSTD?. QF SIOUX CITY, IOWA.

RNFQRCED CONCRETE CONSTRUCTQN.

nitrates,

' Application led October 2d, 1913.

Specicaton oI Letters Patent.

To alt whom t may concern."

Be it -lmown that F, .liosnrH W. BRAGSTAD, a citizen of the UnitedStates, and a resident of Sioux City, in the county "of WoodburyandState of llowa, have invented certain new and useful Improvements inReinforced Concrete Construction, of which. the following is aspecification rlhis invention relates to reinforcedconcreteconstruction;

The rimary object of the invention is the pr uction of an improvedconcrete construction stable. and durable and wherein.

the cost of construction is reduced to the minimum..

Another object is thefproduction of i1nproved sheet-metal plates whichserve both as form and reinforcing members.

' With the above and other objects in View, the invention, consisting inthe construction, combination and novet arrangement of parts, will befully understood from the followingl description, reference being had tothe accompanying drawings which form a part of this application'andinwhich like characters of reference indicate corresponding partsthroughout the several views, of which,-

Figure 1 is a fragmentary horizontal section of` a/kwall constructed inaccordance with my invention; Fig. 2 is a vertical secv tion of amodiedform of Wall suitable as a retaining wall or other structurewherein great strength is required; Fig. 3 is a fragmentary sideelevatio of the reinforcement plates ,employed in theJ modification;Fig: 4 is a fragmentary side elevation of the reinforcing platespresented in Fig. 1; Fig. 5 is a 'vertical section taken on the line a-bof Fig. 4 in the direction indicated. by the arrows.; Fig. 6 is aldetail perspective view of the reinforcement plates; and Fig. 7 is aperspective view of the hollow wall construction. i

'llhe` invention contemplates a concrete construction wherein thereinforcing members comprise outer and inner sheet-metal platesmaintained in parallel and spaced relation to each other by means oftransverse ties, and ada ted to serve as a mold for the reception oconcrete, and upon the outer faces of which plaster or stucco may l beapplied.

The invention may be either applied to monolithic or hollow wallconstruction.. 1n the latter application a continuous dead-air space maybe provided by constructing two vof the above-described walls insuitable spaced relation to each other, and, if desired, the two wallsmay be interconnected, at intervals, by transverse ties.

Referring now to the illustrations, the outer and inner reinforcement orform members are eachcomprised of separate sheetmetal plates, 6, theupper edges of which are bent outwardly at an angle from the plates thusforming wings, 7, which are provided with longitudinal slots, 8; and thelower edges of which are bent at an angle mwardly forming wings, 9,'oppositelydis posed to the wings, 7. Portions of the wings, 9, alinedwith the slots, 8, are sheared and bent outwardly forming tenons, v10.lin assembling the plates the slots, 8, admit the tenons of the platesimmediately above, and the outwardly-angled edges of the plates embracethe inwardly-angled edges of the adjacent plates, as clearly shown inFigs. 2r and 7. When employed-in monolithic construction, where greatstrength is essential, the plates are held in parallelism and lateraldisplacement thereof is prevented by suitable ties, 'such as the rods,11, the ends of which are passed outwardly through apertures, 12, thenbent inwardly through apertures, 13, and the extreme ends bent overadjacent the Vinner faces of the plates. When the invention is appliedin hollow wall conv struction, the separate plates are assembled in themanner previously set forth; however, in order to simplif the process ofcon- `struction and obviate t le expense of additional material forinterconnecting the outer and inner shells, longitudinal strips, 14, are

shoulders, 15, which engage the opposite plates, the reducedportions-being extended through slots, 16, and the protruding ends bentlaterally adjacent the outer face of the plates'. The punchings aredisposed in horizontal rows which are alternately arranged with respectto the rows of the opposite plates. In either monolithic or hollow wallconstruction the plates are arranged in courses and concrete, 17, thenfilled in between them. During the process of filling, portions of thewet concrete will protrude through the slots and other apertures of theplates and this may be troweled up onvthe outer faces of the plates.Stucco or cement,

The free ends 18, may then be applied to the outer faces of the wall.In-hollow wall construction the outer and inner walls, 19 and 20,respectively, (Figs. 1 and 7) are constructed in spaced relation witheach other and interconnected by any suitable cross-members, as thebars, 21, which are, obviously, placed in position as the forms areerected.

In Fig. l an upright timber, 22, extends into the air-space intermediatethe outer and inner walls, to which member is secured a window frame,23, provided with the usual casing, 24; stops, 25; sash, 26; sill, 27;and

blind-stop, 28, which abuts the edge of the outer wall. The spacesintermediate the upright 22 and the inner faces of the walls; and theframe 23 and the edges of the walls, are filled 'with concrete, 17,whereby an airtight connection' between the casing and window isobtained.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is,-

1. In reinforced concrete construction, outer and inner reinforcementandv form members, each comprising separate `plates members, eachcomprising separate integral plates assembled one above the other andprovided with apertures and each plate having upper portions providedwith slots and formed at an angle to the plate; lower portions formed'atan angle to the plate and oppositely to theupper angled portions; tenonssheared from the lower portions and positioned to be received by theslots of the adjacent' plate; elongated intermediate portions punchedfrom the' plate and bent toward the opposite plate, said elongatedportions having free ends reduced and adapted to be engaged Within theapertures of the opposite plate.

3. In reinforced concrete construction, outer and inner reinforcementand form members; eachcomprising separate sheetmetal plates assembled ina vertical plane, edge to edge, and each plate having elongated portionspunched from and bent laterally toward the opposite plate, said platesbeing provided with apertures intermediate the elongated members andadapted to receive the free ends of the elongated portions of theopposite plates, said free ends being reduced to afford shoulders toengage the inner faces of and prevent the plates from displacementtoward each other; and means for interlocking the ed es of each platewith those immediately a jacent.

.In testimony whereof I have hereunto set my hand in the presence ofytwo subscribing witnesses.

' JOSE-PH W. BRAGSTAD.

lVitnesses `M. S. CRAN'DALL, C. M. DUUs.

